Research/Sitter/MAGNDATA / 1.1.24_CrAs.mcif

CrAs

MAGNDATA entry 1.1.24 · source

incommensurate spiral

Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spiral: the spin direction rotates as you move along.

ordered ≤ 265 K (−8 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P2121211′(00γ)00ss
Point group	2221′
Parent space group	P n m a No. 62
Repeats every	2.81 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.3562] 1k
Cell	a 5.65 · b 3.47 · c 6.203 Å · α 90° · β 90° · γ 90°
Transition	265 K (−8 °C)
Measured at	1.5 K
Magnetic ions	Cr
Largest moment component	1.42 μ_B
Method	NPD

Symmetry

Stereogram of the magnetic point group: each operation applied to one direction. Filled = upper hemisphere, ring = lower; red operations include time reversal. Lines are mirrors; polygons are 2/3/4/6-fold axes; the centre ring is inversion.

Every structure in P2121211′(00γ)00ss →

Atom sites · 2 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cr1	Cr	0.0068	0.25	0.2034
As1	As	0.2011	0.25	0.5802

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

Moment components are along the crystal axes a, b, c (μ_B), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

L. Keller et al. PHYSICAL REVIEW B (2015) · doi:10.1103/PhysRevB.91.020409

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.24_CrAs.mcif from MAGNDATA · entry page

sha256 of this copy: 6ca68dd52b70c614ca95635ab19aa7730c1761f9a609eb230900970a6984e805
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.24_CrAs.mcif.